.243 Ackley Improved vs 6mm Creedmoor
A to-scale size comparison of the .243 Ackley Improved and the 6mm Creedmoor, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.243 Ackley Improved (left) beside 6mm Creedmoor (right), shown at the same scale.
The .243 Ackley Improved has an overall length of about 2.71″ with a 0.243″ bullet. The 6mm Creedmoor runs about 2.80″ on a 0.243″ bullet. The two are close in overall length. See the full reference for each: .243 Ackley Improved and 6mm Creedmoor.